Java AWT FontMetrics get font height and width

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;

import javax.swing.JFrame;
import javax.swing.JPanel;

class Demo extends JPanel {
   int curX=0, curY=0; // current position

   public Demo() {
     Font f = new Font("SansSerif", Font.PLAIN, 12);
     setFont(f);/*from w  w  w.  j  a  v a  2  s  . c o  m*/
   }
   public void paint(Graphics g) {

     nextLine("This is on line one.", g);
     nextLine("This is on line two.", g);
     sameLine("This is on same line.", g);
     sameLine("This, too.", g);
     nextLine("This is on line three.", g);
     curX = curY = 0; // reset the coordinates for each repaint
   }

   // Advance to next line.
   void nextLine(String s, Graphics g) {
     FontMetrics fm = g.getFontMetrics();

     curY += fm.getHeight(); // advance to next line
     curX = 0;
     g.drawString(s, curX, curY);
     curX = fm.stringWidth(s); // advance to end of line
   }

   // Display on same line.
   void sameLine(String s, Graphics g) {
     FontMetrics fm = g.getFontMetrics();

     g.drawString(s, curX, curY);
     curX += fm.stringWidth(s); // advance to end of line
   }
}

public class Main {
   public static void main(String[] args) {
      Demo panel = new Demo();

      JFrame application = new JFrame();

      application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

      application.add(panel);
      application.setSize(250, 250);
      application.setVisible(true);
   }
}